To find the DNS Authority Record (SOA) for a DNS domain, you can use the dig command with the SOA option.
For example:
dig SOA example.com
This will display the start of authority (SOA) record for the example.com domain. The SOA record contains information about the DNS zone, including the name of the primary name server and the domain administrator's email address.
You can also use the nslookup command to query the SOA record for a domain:
nslookup -type=SOA example.com
This will display the SOA record for the example.com domain.
For more information on the dig and nslookup commands and their options, you can refer to the documentation or use the man command to view the manual pages.